Table 2.
Covariate | No. of Patients (men) | RT (%) |
Univariable |
Multivariable |
|||||
---|---|---|---|---|---|---|---|---|---|
Recommended | Not Recommended | Odds Ratio | 95% CI | P | Odds Ratio | 95% CI | P | ||
Year of diagnosis (per year increase) | 3,125 | 0.96 | 0.94 to 0.98 | < .001 | 0.93 | 0.91 to 0.96 | < .001 | ||
Median age at diagnosis (per year increase), years | 3,125 | 36 | 35 | 1.01 | 1.00 to 1.02 | .111 | 1.01 | 1.00 to 1.02 | .127 |
Range | 17-81 | 13-82 | |||||||
Proportion of county (age > 25) with less than a high school education (per % increase) | 3,125 | 15.4 | 15.6 | 0.96 | 0.95 to 0.98 | < .001 | 0.95 | 0.93 to 0.96 | < .001 |
Range | 3.7-41.5 | 6.3-42.2 | |||||||
Race | |||||||||
White | 2,876 | 81.0 | 19.0 | 1.0* | — | 1.0* | — | ||
Nonwhite | 249 | 83.1 | 16.9 | 1.16 | 0.82 to 1.63 | .413 | 1.20 | 0.84 to 1.71 | .322 |
SEER region | |||||||||
South | 258 | 78.7 | 21.3 | 1.0* | — | 1.0* | — | ||
West | 1,644 | 83.2 | 16.9 | 1.34 | 0.97 to 1.85 | .080 | 1.43 | 1.03 to 1.98 | .034 |
Midwest | 782 | 80.7 | 19.3 | 1.13 | 0.80 to 1.60 | .483 | 1.36 | 0.95 to 1.95 | .089 |
Northeast | 441 | 76.2 | 23.8 | 0.87 | 0.60 to 1.26 | .449 | 1.02 | 0.70 to 1.48 | .935 |
Tumor category | |||||||||
T1 | 2,451 | 80.8 | 19.2 | 1.0* | — | 1.0* | — | ||
T2 | 604 | 83.0 | 17.1 | 1.15 | 0.91 to 1.46 | .232 | 1.27 | 0.99 to 1.62 | .057 |
T3/T4 | 70 | 78.6 | 21.4 | 0.87 | 0.49 to 1.55 | .638 | 0.86 | 0.48 to 1.56 | .620 |
Tumor size, cm | |||||||||
≤ 4 | 1,872 | 80.3 | 19.7 | 1.0* | — | 1.0* | — | ||
> 4 | 1,253 | 82.4 | 17.6 | 1.15 | 0.96 to 1.38 | .141 | 1.12 | 0.92 to 1.35 | .257 |
Abbreviations: RT, radiation therapy; SEER, Surveillance Epidemiology and End Results.
This group served as the reference group in the logistic regression analysis.